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This article deals primarily with the problem of determining the cutting force when machining hardened steels. For this study, the steel used was 100 Cr6, number 1.3505. The secondary aspects of the study focused on the evaluation of the surface quality of machined samples and the recommendation of cutting conditions. A wide variety of components are used in engineering, the final heat treatment of which is hardening. These components are usually critical in a particular product. The quality of these components determines the correct functioning of the entire body of technical equipment, and ultimately, its service life. In our study, these are the core parts of thrust bearings, specifically the rolling elements. The subject of this experiment involves machining these components in the hardened state with cubic boron nitride tools and the continuous measurement of the cutting force using a dynamometer. The machining is carried out on a conventional lathe. A total of 12 combinations of cutting conditions were set. Specifically, for three cutting speeds of 130, 155 and 180 m center dot min(-1), the feed rates of 0.05 and 0.1 mm center dot rev(-1) and the cutting widths of 0.2 and 0.35 mm, were evaluated The evaluation assessed the surface quality by both touch and non-touch methods. A structural equation with the appropriate constants and exponents was then constructed from the data obtained using the dynamometer. The experiment confirmed the potential of achieving a value of the average arithmetic profile deviation Ra in the range of 0.3-0.4 when turning hardened steels with cubic boron nitride.

This article discusses the issue of hardened steel machining. Many components in theengineering industry use hardening as the final heat treatment. These components usually occupya significant position in a given assembly unit. They guarantee the correct operation of the entiretechnical equipment in total cooperation with other components. The quality of these componentsdepends on the integrity of their surface. The production of these parts is usually carried out bytraditional technological procedures. Clearly, an example of such a technology is grinding. However,this article discusses the application of other finishing technologies using a tool material made ofcubic boron nitride (CBN). The technology used is finishing turning with subsequent tumblingtechnology. The subject of the evaluation is the integrity of the surface. In this part of the experiments,there are mainly individual parameters of surface roughness. Compared components are bearingrings, in this case the inner surface of the housing ring.